Metallic guard for concrete curbing and the like.



Y O. W. DENNY. METALLIC GUARD FOB. CONCRETE GURBING AND THE LIKE.APPLICATION FILED JULY 12, 1910.

1,086,758; Patented Feb. 10, 191

INVENTOR COLUMBIA PLANOGRAPH co.,\vAsHlNaTcN, n. c.

UNITED STATES FPATEN FIC.

CHARLES W. DENNY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 CLIP BARMANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OFPENNSYLVANIA.

METALLIC GUARD FOR CONCRETE CUBBING AND THE LIKE.

Specification of Letters Patent.

Patented Feb. 10, 1914.

Application filed July 12, 1910. Serial No. 571,572.

To all whom it may concern Be it known that I, CHARLES IV. DENNY,citizen of the United States, residing in the city of Philadelphia,State of Pennsylvania, have invented certain new and useful Improvementsin Metallic Guards for Concrete Curbing and the like, of which thefollowin is a full, clear, and exact description, reference being had tothe accompanying drawings, forming a part of this specifica- 51011.

My invention relates to metallic protecting guards for rounded cornersof concrete curbing, pillars and the like, designed to furnish means toprotect from abrasion the rounded edge or corner portion of suchconcrete structures which is exposed to the destructive impact of wagonwheels and the like.

My improvement in that class of devices has for its several objects toprovide a me tallic protecting guard which shall, owing to its exteriorform, have an increased tendency to convert an impact blow into asliding contact, and owing to its interior form, including itslongitudinal flanges, present means, integral in the device, for notonly fully incasing the rounded corner of the con crete curbing, but forinclosing a large portion of the body of the concrete structure andforming an interior locking engagement therewith. My novel guard device,by reason of its flanges, also presents means for operatively assemblingtherewith a series of anchors of such character as to not only reinforcethe whole concrete structure, but furnish reliable aid to reinforce theholding power of both of the longitudinal flanges and also to fixedlyinterlock both of said elements with each other and with the concretestructure by a body of concrete, forming part thereof, lying between thesaid elements when operatively assembled; and finally to provide adevice, consisting of such elements, capable of such combination witheach other and with a concrete curbing, or the like, which may bereadily rolled or pressed" from sheet metal, and assembled with facilityfor the purposes and in the manner stated.

To these ends my invention consists of a metallic strip constituting theprotector or guard proper, of suitable width, curved in cross-section,approximately a quarter circle exteriorly, and provided with inturnedflanges on each of its opposite longitudinal edges of such relativeangularity as to produce an interlocking effect on the underly ing bodyof concrete and on a suitable coacting anchoring device.

In the preferred form of my device, the guard-strip is rounded incross-section, of a curvature which is approximately an arc of a circleand of less length than a quartercircle, with narrow tangentiallyextended portions on each side, which are straight, and in a plane atright angles to each other, each of the same terminating in an inturnedflange approximately at a right angle thereto; also the combinationtherewith, of a series of anchorage plates, preferably in the form of aloop, but of such character that its terminal ends may engage both ofsaid flanges of the guard strip, and provide therewith an additionalinclosing band of metal surrounding a comparatively large body ofconcrete forming part of the concrete structure, and interlocking saidmetallic elements to each other and to substantially the entire body ofconcrete.

In the drawings illustrating my inven tion: Figure l is a sectional viewshowing my device, in its best form, as applied to a concrete curbing.Fig. 2 is an end, elevation, detached, of the metallic guard strip andone of the anchor irons operatively assembled. Fig. 3 is a rear sideview of the same. Fig. 4 is an end view of a modified form of themetallic guard-strip, Fig. 5 an elevation, of one of the anchor ironsdetached, and Fig. 6 illustrates a modified form.

The preferred form of my metallic guard strip is shown in Figs. 1, 2 and3; while the modified form thereof is shown in end elevation in Fig. 4.Referring first to the former, 2 indicates a vertical cross-section of aportion of a concrete curbing, including its rounded corner 3, a portionof the otherwise usual face of which is supplied by my guard strip. Thelatter is a rigid strip of metal, preferably iron or steel, molded orrolled, of a thickness which will vary somewhat, but very slightly,according to the service to which it is applied. In practice, forordinary use, it may be of uniform thickness, but I prefer to make itrelatively thicker in its central portion, as at 4, to give it increasedstiffness and rigidity, if used for street curbing where hard usage iscommon. In respect of that portion of its contact surface, whichcomprises about the central three-fifths of its width, indicated at 5 inFigs. 1 and 2, it is essentially of a curvature which is approximatelycircular. If it be made in the modified form shown in Fig. 4: itsperipheral width should be substantially a full quarter-circle incross-section, as indicated at 7, and provided with inwardly-projectingflanges S-8 of like character on each of its longitudinal edges; theseflanges may be at right angles to each other as in preferred form, Figs.1 and 2, but preferably are bent to form an angle slightly less thanwould be formed by diametric lines, indicated by the dotted lines inFig. 4:; such construction producing an increased holding effect ashereinafter described.

Describing more particularly the preferred form of the guard-strip byreference to Figs. 1 and 2 it will be seen that in the region of thecentral portion of its peripheral width, which is about three-fifthsthereof, indicated at 5, its,.curvature is substantially that of an arcof a circle, with two narrow longitudinal portions, indicated at 9, 9,these proceeding tangentially from the termini of the central curvedportion, in straight lines which are substantially at right angles toeach other, and each of the terminal edges thereof provided with aninturned'flange indicated at 8, 8 in Figs. 1 and 2, at right anglessubstantially, to each other and to the respective flat portions 9,9,from which they proceed. These flanges are of a depth substantiallyequal to the width of the flat portions 9, 9, of the body of themetallic strip; but they may be made some what deeper if desired,especially if the reinforcing and anchorage irons presently to bedescribed are not used therewith.

As a guide to the correct dimensions, it may be stated that the elementsshown in the drawings are drawn to a scale from actual constructionswhich I have applied to use and are of full size for a concrete curbshown at 2 in Fig. 1.

It will be seen that the oppositely-disposed flanges on the longitudinaledges of the curved guard strip operate as integral holding or primaryanchoring devices therefor, and their position in the concrete,relatively to the curved peripheral surface of the strip is such as toeffectually resist any dislodging force applied to either longitudinaledge of the strip, their interlocking and holding force being appliednot to the mere surface of the rounded corner of the concrete curb butto a large body thereof lying between such flanges and the inner surfaceof the strip. In order to reinforce this holding power of the flangedstrip, when used for street curbing, I employ a series of anchoringirons, shown in detached side elevation in Fig. 5 and in assembledposition in Figs. 2 and 6. These are arranged in series, as illustratedin the rear side view Fig. 3, and each consists of a piece of flatmetal, subtantially of the width and thickness shown, to accord with thestrip element, and bent into loop-form as at 6, preferably a round loopto give more holding surface, and preferably having its extreme terminalends bent to form lips 6 6, adapted to rest against and coincide withthe inner face of the flanges 8 of Fig. 2 or 8 of Fig. l, when saidelements are operatively assembled as illustrated in Fig. 3; and ifproperly constructed, as shown and described, said anchoring loops willpossess suflicient elasticity to enable the operator to spring them intoplace in'the guard-strip, where they will exert a powerful frictionalholding effect on the strip flanges due to such created tension.

I prefer the form of guard-strip shown in Figs. 1 to 3, as it gives twonarrow flat surfaces coinciding with the flat rise and tread surfaces ofthe curb, while its curvature is at its central portion only, where thedestructive impact blow is most commonly received, and because also itenables me to give the protected concrete a rounded corner of shorterlength than when employing the full quarter-circle strip illustrated inFig. l.

I am aware that it is not new to form a metallic curb-guard with anexterior curved surface and with a single flange, but such a deviceoperates to give only a more or less permanent hold on the concretestructure on one of its longitudinal edges only, and is radicallydifferent both structurally and functionally from mine wherein both theopposite longitudinal edges of the curved protector-guard are providedwith inturned flanges, forming a wide and deep curved recess, betweenthem and the interior curved surface of the guard, into which a largeportion of the concrete structure enters, the flanges being embeddedtherein; and the flanges being at an angle to the curved body portion ofthe guard it is practically impossible to dislodge the same withoutdestroying a large body of the concrete curbing. The flanges may be madedeep enough to alone effect a sufficient hold on the concrete, as theylie in relative planes which best resist dislodgment, as shown in Fig.1; but the holding effect of the flanges will be reinforced by extendingtheir hold through a larger portion of the concrete body, through a themedium of the series of anchorage irons 6 constructed as described, andassembled, in the manner stated, with the inetallic guard-strip.

As usual in forming such concrete structures a moldboard is placed inposition to support temporarily the metallic guard-strip and itsanchoring irons, the said elements being first assembled as stated, whensuch anchoring irons are used, and the concrete structure then built upin the usual Way, care being taken to force the concrete well into theinterior of the curved strip and between its flanges and within thelooped anchor-irons; with the result, when my device is employed, asindicated in Fig. 1, that a large body of concrete, forming practicallythe entire rounded corner of the curb lies between the inner face of theguard-strip and its angular flanges, and is effectually bound theretoagainst dislodging impact blows, and this effect is aided by thecoincidence, in the same plane, of the flat edge portions of theguard-strip with the adj oining flat tread and rise surfaces of thecurbing.

I am also aware that anchors and anchoring devices have been used tomaintain metallic corner-guards in place on concrete curbing, but allsuch that I am aware of have been more or less straight rods and thelike, connected to the guard-strip and merely embedded lengthwise in theconcrete and hence readily pulled out; whereas in my device theanchoring loops, w ien embedded in the concrete, cannot be pulled out,owing to their form and character without dislodging the great body ofconcrete between them and the inner face of the guard-strip; and, owingto their relation to both the flanged edges of the guard-strip when theelements are operatively assembled, operate to so firmly hold theguard-strip on the corner of the curbing as to make it impossible toremove it short of destroying the integrity of the whole concretestructure.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a device of the character stated, a metallic guard having acentral portion curved in cross-section to approximately a quadrant andwhich is thicker at the middle than at the edges, adjoining straightportions on opposite sides thereof at right angles to each other, andterminal inturned short flanges thereon substantially at rightangles tosaid straight portions and to each other.

2. In a device of the character stated, a curved metallic guard havinginturned flanges on its longitudinal edges, each converging at an anglewhich would intersect the other, and a series of anchors each bent tobring its terminals within said flanges of the guard and itsintermediate portion bowed away from the guard, said anchors beingassembled relatively to the guard in spaced relation to each other.

3. In a device of the character stated a curved metallic guard striphaving inturned and relatively converging flanges on its longitudinaledges, and a series of metallic anchoring loops each having a springtension imparted to its terminals and initially engaging said flanges ofthe guard for support during the placing of the concrete, said loopbeing spaced from the guard to permit concrete to pass between saidelements.

4. In a device of the character stated, a metallic strip curved incross-section and having an inturned angular flange on each of itslongitudinal edges, adapted to form a continuous locking engagement withthe concrete, and a series of anchoring loops having terminals sprungbetween and fixedly engaging both flanges of the guard-strip.

5. In a device of the character recited, the combination with a metallicstrip curved in cross-section, and having an inturned flange on each ofits longitudinal edges, of a series of loop-shaped anchors with lips attheir terminal ends coinciding and forming a locking engagement withboth of the oppositelydisposed flanges of the guard-strip.

6. A corner guard for concrete curbing and the like, consisting of ametallic strip curved in cross-section and provided with an inturnedangular flange on each of its longitudinal edges, in combination with aseries of anchor irons having terminals coinciding with and engagingsaid flanges respectively and a body portion in the form of a loopprojecting inwardly and opposite to the inner face of the guard-strip.

7. In a protected concrete structure having a rounded corner, a metallicstrip which is curved in cross-section to coincide substantially withthe rounded corner of the concrete structure, said metallic strip havingcontinuous flanges on its longitudinal edges entering the concrete in adirection to interlock with the body portion thereof; and a series ofmetallic anchor-loops embedded in the concrete, and engaging, by theirrespective ends, the opposite flanges of said metallic guard-trip.

In testimony whereof, I have hereunto aflixed my signature thistwenty-fifth day of June, A. D. 1910.

CHAR-LES W. DENNY.

Witnesses:

A. E. DAVIS, A. M. BIDDLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

